STR2A153 vs STR2A153D SMPS IC

[dkneyle]

The device I want to replace does not have the 'D' suffix, but the replacement I have in my parts drawer does have the 'D'.

I can't find any specific datasheet on the net for a 'D' variant. Do you reckon it's just slightly spec'd up and hence the designation: D?

[sam_sam_sam]

Re: STR2A153 vs STR2A153D SMPS IC

Here is the data sheet

https://datasheetspdf.com/mobile/938...ken/STR2A153/1

[dkneyle]

Re: STR2A153 vs STR2A153D SMPS IC

Yes, thanks, I had the datasheet. But it makes no mention of a 'D' variant, hence why I was asking around if anyone had any experience with this SMPS IC?

In the repair I'm doing it is used in a Pioneer Receiver VSX-529. The IC is rated at about 35W output. It directly drives the switching circuit - no external mosfet. I gather it is used in an auxiliary supply which must power the logic circuits etc of the receiver?

[R_J]

Re: STR2A153 vs STR2A153D SMPS IC

On other versions the `D' stands for auto restart on OVP, TSD Operation

[dkneyle]

Re: STR2A153 vs STR2A153D SMPS IC

On other versions the `D' stands for auto restart on OVP, TSD Operation

Hi RJ,

You might need to spell out those acronyms for me?

And in terms of a SMPS, what does auto restart actually mean? If mains power was lost, and then came on again, I would have thought any SMPS would start up again. So I'm obviously missing something?

[R_J]

Re: STR2A153 vs STR2A153D SMPS IC

I am looking at the STRA3A200 datasheet

− Overvoltage Protection (OVP) : Latched shutdown or
auto-restart
− Thermal Shutdown (TSD) : Latched shutdown or
auto-restart with hysteresis

[dkneyle]

Re: STR2A153 vs STR2A153D SMPS IC

Thanks RJ. I think that does explain it most likely. "Latched Shutdown" is abnormal condition keeping the SMPS switched off; auto-restart where it does exactly that after the condition is removed.